Leg pain and milk intake. The leg pain!

Hi Doctor, I am not sure if this is the right way to contact, but I am really worried, my son is 2.5 years old, he complains of leg pain at night almost everyday now, this is an issue we have been facing since 1 year, he complains and even if i soothe him down and make him sleep but he will stll wake up from his sleep from that pain. the only way to handle this is by giving him one dose of paracetamol, it s like i have started giving him this daily, we have consulted doctor and they suggest it a growth pain but i am still concerned, we had his blood test and everything was ok, we also tried giving him zincovit and calcimax for more than a month, but that also could not help, one more thing to note is his milk intake was always very less, till 1.5 year i breastfed him and after that also he does not drink much milk, some or the other time he can drink very small quantity of milk but not that much. can this be the reason of the leg pain